Businesses replace equipment steadily and without ceremony. A laptop gets slow and is traded in. A phone is upgraded and the old one sold or handed to a family member. A broken printer goes to the tip. None of this feels like a data event, because the point of the exercise was the hardware, not what was on it. Yet each of these devices spent years holding whatever passed through it, and getting rid of the box does not get rid of the contents unless someone takes a deliberate step to make it so.
Deleting files, it turns out, is not the step people imagine it to be. Dragging things to the bin and emptying it removes the signpost to the data, not the data itself, which sits on the drive until something happens to write over it. Anyone mildly determined, with freely available tools, can recover a great deal from a drive that was merely emptied, which is why devices bought second-hand are sometimes found to be full of a previous owner's documents, photographs and saved passwords. The person who sold it was not careless in their own mind; they thought deleting was enough.
The less obvious offenders are the devices nobody thinks of as computers. A modern office printer or photocopier often has a hard drive inside it that keeps images of what it has scanned, copied and faxed, sometimes for a long time. Phones hold not just messages and photographs but saved logins to apps that stay logged in. A tablet used for taking card payments has seen a lot. When these leave the business, they take that history with them, and no invoice or disposal note records the fact.
The habit worth forming is simple and applies to everything with a memory. Before any device leaves, ask what was on it and make the contents genuinely unrecoverable — a full factory reset for phones and tablets, a proper drive wipe or physical destruction of the disk for computers, and for a photocopier a call to the supplier about clearing its stored images. For anything that held something truly sensitive, destroying the drive is cheaper than regretting it. The rule of thumb is short: the data does not leave when the device does, unless you made it leave first.